Operational amplifier with JFET inputs having low input bias cur

Details Operational amplifier with JFET inputs having low input bias cur Operational amplifier with JFET inputs having low input bias cur

1995-03-31

1996-07-16

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, H03F 345

Patent

active

055370780

ABSTRACT:
This invention relates to operational amplifiers (opamps) which use junction field effect transistors (JFETs) for the differential input pair to achieve a low input bias current. More particularly, the present invention relates to opamps wherein each input of the opamp drives directly only one gate of its corresponding JFET to further reduce the input bias current. In one embodiment of the present invention, the bottom gate of each JFET of the differential input pair is directly coupled to the common source node of the differential input pair. In another embodiment of the present invention, the bottom gate of each JFET of the differential input pair is directly coupled to the common source node and a resistor is coupled in series with the top gate of each JFET. In the preferred embodiment of the present invention, the bottom gate of each JFET of the differential input pair is coupled to the common source node through a resistor.

REFERENCES:
patent: 4044313 (1977-08-01), Wittlinger et al.
patent: 4639683 (1987-01-01), Counts et al.

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